Valve mechanism.



H. R. ATWATER & E. S. GARMAN.

VALVE MECHANlSM.

APPLICATION FILED SEPT. 7, 1912.

Patented Dec. 8, 1914.

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VALVE MECHANISM.

APPLIUATION FILED SEPT.7,1912.

Patented Dec. 8, 1914.

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THE MORRIS PETRS C9.. PHOTD-LIFHO., WASHINGTON. D- U HARRY It. ATWATER AND EDWN S. CARNI-LN, OF CLEVELAND, OHIO, ASSIGNORS T THE OSBORN MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

VALVE MECHANISM.

Application filed September 7, 1912.

the best mode in which we have contemplated applying that principle, so as to distinguish it lrom other inventions.

The present invention relates in general to valve mechanism, and particularly to an automatically acting valve adapted to be used with a j arring molding machine, such as is shown in the Patent No. 1,008,299, issued November 1li, 1911, to Harry Il. Air water. The present valve is intended to `2o supplant the valve mechanism which is there shown for controlling the supply and exhaust of air to and from the tubular support.

The present invention may, however, be

applied to various other uses Wherever an automatically acting plunger valve is desired, since it will be seen that our invention may be adapted with but little change to numerous other constructions.

To the accomplishment oi the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of the various mechanical forms in which the principle of the invention may be used.

In said annexed drawings :HFigui-e 1 is a central vertical section through the tubular support of the molding machine and through the valve casing, showing the plunger valve in side elevation; Fig. 2 is in different operative positions, and Figs.

5, 6, 7, 8 and 9 are sections at different points through the valve casing and plunger illustrating details of construction such sections being taken on the lines 5 5, 6G,

7--7, 8 8 and '9-9, respectively; and Figs.

Specification of Letters Patent.

zirtonted Dec. 8, 1914.

Serial No. 719,228.

.l0 and l1 are details of construction, showing the upper end ol the stem attached to thel valve plunger together with one of the adjusting nuts for the same.

In Fig. l there is shown a tubular support 1 in which there is disposed a reciprocable piston member 2 upon the top of which will be carried a suitable pattern plate holder (not shown). The piston member is provided with a laterally projecting shoulder 3 which is adapted to contact and strike against the top of the tubular support. The piston part oi the member 2 will be slightly less in length than the depth oil? the tubular support, thus providing at all times a space between the bottom or the piston and the bottom of the support. Connecting with this space, is a passage Ll leading to the exterior of the support. Attached at the side ot' the support is a valve casing 5 having an inlet port 6 connected with the pipes 7 leading to a suitable source of fluid pressure supply, and an exhaust passage S which may be connected to the pipe 9 leading either to the atmosphere or to a suitable exhaust reservoir, such as a drain. rlwo openings l0 and 11 connect the interior of the casing with the passage -l extending through the support, and these two openings will be controlled by the plunger 12 which is reciprocahly mounted in the casing. Each of these openings 101 will extend in grooves 13 around the interior ot' the casing, thus balancing the pressure on all sides of the plunger, and allowing the saine to move freely up and down in the casing. In one side oi? the casing there is disposed a bypass lll extending slightly below the inlet passage (i to a point in the upper part of the casing. Such by-pass is also extended at the upper end around the interior of the casing in a groom in order to completely equalize and balance any pressure existing against the plunger. Slightly above the ripper end of this by-pass is an exhaust passage 16 opening into the atmosphere and controlled by the plunger.

It will be noticed that the interior of the casing is :formed with various sized chambers, and the plunger is provided with an enlarged portion 17 adapted to reciprocate and to be received only in the upper and larger chamber. Frein the bottom of this upper chamber a by-pass 18 extends to near tel the top of the same, such bypass opening into the chamber termed by a cap 19 attached te a valve stem 2O and the toa of the casing. IThis cap 19 is loosely itted onto the casing, thus permitting the passage ot air beneath it and the casing. rl`he upper part ot the valve stein is threaded and is adjustably engaged by two nuts 21 and 22. The piston member is termed with a projection 25 which is apertured to receive the valve stem.

rEhe operation of the valve is controlled, to some extent, by the reciprocation of the piston member and by means of the extension and he two nuts 21 and 22. ln Fig. 1 the valve is shown in its lowest position completely closing the exhaust passage from the support to the atmosphere or reservoir, and permitting the air to enter beneath the piston through the tube 7 and the passages 6 and 10 around the shaft 26 connecting the two larger portions of the plunger. 1n such a position the upper nut 21 is resting on the extension 25. llvlhen air is admitted beneath the piston, the piston is raised and the plunger is simultaneously raised into an upper position until the exhaust port is within a short distance of opening, as shown in At this point in the plungers movement the exhaust port around the sup port is not open. The portion of the valve normally adjacent to the inlet ports is much smaller in diameter than the rest of the plunger, the two port-controlling portions being connected by a small wrist or shaft 26. rlhe enlarged portion 17 of the plunger has by this movement uncovered the upper end of the by-pass 1li and air is therefore 1, admitted beneath the shoulder on such enlarged portion, thus shooting the plunger upward and opening the exhaust port 11 and closing the inlet port 10 simultaneously. At the time the exhaust port 11 is wide open and the inlet port entirely closed, the enlarged portion of the plunger uncovers the port 1G allowing the air under the shoulder to escape, the valve at this po sition closing port 11. rIhe weight ot the plunger will cause it to drop as soon as the air under the shoulder is exhausted. This downward movement will close the exhaust port 16 and will reopen the by-pass 14, admitting air under the shoulder and shooting the plunger upward, again opening the exhaust port 16, allowing the air to escape and permitting the plunger to again drop. This action is theoretical rather than actual, for the opening oli' the exhaust port 11 allows the piston member to fall and contact of the extension 25 upon the lower nut 22 will force the plunger down. This will be done so rapidly that the fore-going reciprocating action of the plunger will be prevented. The plunger will, of course, be held in such balanced position until the eX- tension 25 has slid along the valve stem 2O into contact with the nut 22, but for all practical purposes this action will be instantaneous. At this point the by-pass port lfl is uncovered again admitting the air under the shoulder of plunger 20, holding nut in contact with lug 25 while the piston 2 is descending, thereby doing away with the necessity of springs, catches, etc. The plunger will now be forced across the inlet and exhaust ports, the opening and closing being simultaneous on account of the lower portion Vozt the plunger being equal in length to the distance between the upper edge of the inlet port and the lower edge ot the exhaust port. The position ot the adjustable nut 22 on the valve stem will determine to what extent, lif at all, the fall of the pister. member will be cushioned by compressed air beneath the piston in the support. By moving the nut 22, a considerable cushioning effect may be secured or the piston member maybe allowed toV strike Ywith its fullV weight, although in such a machine a slight cushioning will ybe desirable. The continued downward movement Vof the plunger will uncover the second by-pass 18, thus allowing the air beneath the shoulder to escape into the chamber between the cap 19 and the top of the valve casing. From here the air is allowed to discharge by reason of the loose lit between the cap and the casing.

Lubrication of the plunger is secured by three oil grooves 30, 31 and 32 (see Fig. 9) connected by a passage 33 with an opening 3a'- to which may be attached an oil reservoir. Each bearing surface of the plunger is lubricated by one of these grooves which extend completely around the casing and are so disposed relatively to the movement of the plunger, that the grooves are never wholly uncovered, thus preventing the oil :trom spilling out into the casing.

The length or" the stroke of the piston may be varied by shifting the nuts 21 and 22 on the plunger or valve stem, the sleeves of which 23 may be arranged by pins 35 and 36 passing through slots 37 and 38 in the nuts. The nuts are provided with the threaded extensions or sleeves 23 and 2l tor the purpose of engaging the stem, the sleeves tting slidably in the aperture in ico the projecting lug on the piston member Y our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

We therefore particularly point out and distinctly claim as our invention:-

1. The combination with a tubular support open at its top, a piston member reciprocably mounted in said support, and means adapted to sharply arrest the fall of -the said piston, thereby jarring the same,

said support having inlet and exhaust openings below said piston; of a casing connect ing such inlet opening with a Huid-pressure supply, said casing having two alined tubular chambers oit' unequal diameters; a plunger' reciprocably mounted in such chambers in said casing and having a stem extending ex teriorly of the same, said plunger being adapted to control such openings; spaced lugs attached to said stem; an extension on said piston slidably engaging such stem between said lugs; and a tube connecting such Huid-pressure supply with such chamber of larger diameter, the flow in such tube being controlled by the movement of said plunger.

2. The combination with a tubular support open at its top, a piston member reciprocably mounted in said support, and means adapted to sharply arrest the fall of the said piston, thereby jarring the same, said support having inlet and exhaust openings below said piston; of a casing connecting such inlet opening with a fluid-pressure supply, said casing having two alined chambers of unequal diameters; a plunger reciprocably mounted in such chambers in said casing and having a stem extending eXteriorly of the same, said plunger being adapted to control such openings; means operatively connecting said piston and such stem; a cap, attached to such stem and movable therewith, extending over and fitting loosely around said casing; and means adapted to allow, the fluid-pressure used in reciprocating said plunger, to escape between said casing and said cap.

3. The combination with a tubular support open at its top, a piston member reeiproeably mounted in said support, and means adapted to sharply arrest the Yfall of the said piston, thereby jarring the same, said support having inlet and exhaust openings below said piston; of a casing connecting such inlet opening with a luid-pressure supply, said casing having two alined chambers of unequal diameters; a plunger reciprocably mounted in such chambers in said casing and having a stem extending ex-` teriorly of the saine, said plunger being adapted to control such openings; means operatively connecting said piston and such stem; a cap, attached to such stem and mov able therewith, extending over and fitting loosely around said casing; a tube connecting such fluid-pressure supply and such chamber of larger diameter; and a second tube connecting the lupper and lower parts of such larger chamber, the flow in such tubes and the exhaust between said cap and said casing being controlled by the movement of said plunger. 1qigned by us this 31st day of August,

HARRY R. ATl/VATER. EDWIN S. CARMAN.

Attested by- M. W. ZEMAN, M. A.TRA1NOR.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

